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teach codegen to handle noop casts as lvalues. 

llvm-svn: 67164
This commit is contained in:
Chris Lattner 2009-03-18 04:02:57 +00:00
parent dc78bd9f79
commit 63d06ab65a
2 changed files with 21 additions and 0 deletions
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13
clang/lib/CodeGen/CGExpr.cpp
View File

@ -179,6 +179,19 @@ LValue CodeGenFunction::EmitLValue(const Expr *E) {
return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
case Expr::ChooseExprClass:
return EmitLValue(cast<ChooseExpr>(E)->getChosenSubExpr(getContext()));
case Expr::ImplicitCastExprClass:
case Expr::CStyleCastExprClass:
case Expr::CXXFunctionalCastExprClass:
case Expr::CXXStaticCastExprClass:
case Expr::CXXDynamicCastExprClass:
case Expr::CXXReinterpretCastExprClass:
case Expr::CXXConstCastExprClass:
// Casts are only lvalues when the source and destination types are the
// same.
assert(getContext().hasSameUnqualifiedType(E->getType(),
cast<CastExpr>(E)->getSubExpr()->getType()) &&
"Type changing cast is not an lvalue");
return EmitLValue(cast<CastExpr>(E)->getSubExpr());
}
}

8
clang/test/CodeGen/exprs.c
View File

@ -58,4 +58,12 @@ void f0(void (*fp)(void), void (*fp2)(void)) {
int x = fp - fp2;
}
// noop casts as lvalues.
struct X {
int Y;
};
struct X foo();
int bar() {
return ((struct X)foo()).Y + 1;
}